Animals & nature · 2021
Will cats sit inside an illusory square without a real outline?
Yes—some cats did in a small home experiment. Cats selected an illusory square as often as a square with real contours, and more often than a control pattern. But only nine of the 30 cats that completed all trials sat within any test shape, so the finding suggests rather than proves that cats treat illusory boundaries like real ones.
Details
Researchers used cats’ attraction to box-like spaces to investigate their response to the Kanizsa square, a visual illusion that gives the impression of a square without a real square outline. Owners observed and video-recorded their cats at home across six daily trials, comparing the illusion, a square with real contours, and a control pattern.
A selection counted when a cat sat inside a shape’s boundaries with all its limbs for at least three seconds. The illusion was selected as often as the real-contour square and more often than the control. This behavior is consistent with cats responding to an implied boundary, but it does not establish that they experience the illusion as humans do.
The study reached more than 500 cats and owners, but only 30 completed all trials, and just nine cats made any qualifying selection. That substantial dropout and the small number of cats contributing selections limit how broadly the result can be applied. Replication in controlled settings would help test the finding.
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